/*
  *   Copyright (c) 1998, Regents of the University of California
  *   All rights reserved.
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions are met:
  * 
  *       * Redistributions of source code must retain the above copyright
  *         notice, this list of conditions and the following disclaimer.
  *       * Redistributions in binary form must reproduce the above copyright
  *         notice, this list of conditions and the following disclaimer in the
  *         documentation and/or other materials provided with the distribution.
  *       * Neither the name of the University of California, Berkeley nor the
  *         names of its contributors may be used to endorse or promote products
  *         derived from this software without specific prior written permission.
  * 
  *   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
  *   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  *   DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
  *   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



package org.demis.elf;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author <a href="mailto:demis27@demis27.net">Stéphane Kermabon</a>
 */
public class UniqueConstraint {

    private String name;

    private Table table;

    private List<ColumnReference> referencedColumns = new ArrayList<ColumnReference>();

    public UniqueConstraint() {
        // no op
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Table getTable() {
        return table;
    }

    public void setTable(Table table) {
        this.table = table;
    }

    public void addColumnReference(ColumnReference reference) {
        referencedColumns.add(reference);
    }

    public void addColumn(Column column, int order) {
        ColumnReference reference = new ColumnReference();
        reference.setColumn(column);
        reference.setOrder(order);
        reference.setColumnName(column.getName());
        referencedColumns.add(reference);
    }

    public List<ColumnReference> getColumnReferences() {
        return referencedColumns;
    }

    public List<Column> getColumns() {
        List<Column> result = new ArrayList<Column>();

        for (ColumnReference reference: referencedColumns) {
            if (reference.getColumn() != null) {
                result.add(reference.getColumn());
            }
        }

        return result;
    }

    public int nbColumn() {
        return referencedColumns.size();
    }

    public Column getColumnAs(int pos) {
        for (ColumnReference reference: referencedColumns) {
            if (reference.getOrder() == pos) {
                return reference.getColumn();
            }
        }
        return null;
    }

}
